General Motors Complaint - Faulty Torque Converter Lockup
ATLANTA, GEORGIA -- I just modified my Chevrolet Lumina transmission to prevent slippage of the lock-up torque converter. It seems that this feature fails on most 4T60E transmissions and other models also. It occurs when two regulating valves in the valve body simply wear out the valve body and do not sustain pressure to the torque converter. These valves vibrate as a normal function of trans. operation. The modification involves aftermarket valves and boring the valve cavities.
GM has known about this problem for some time and avoided the expensive repair to fix it. It can occur at 50K to 100K miles. I was prevented from obtaining a emission cert. for my car because the problem causes the "check engine" light to stay on. Even though the problem does not affect emissions, the light on will fail the car on the emission test.
While I am a loyal GM customer, they should have handled this problem or not connected the check engine light to the engine/trans. slippage.